From Pathfinder Bestiary 2, which isn't enabled.

Giant Whiptail Centipede

CREATURE 3

HUGE ANIMAL

Whiptail centipedes are sleek and swift tunnel predators.

Perception +9; darkvision

Skills Acrobatics +8, Athletics +10, Stealth +8

Str +4, Dex +2, Con +4, Int -5, Wis +2, Cha -4

AC 19; Fort +11, Ref +9, Will +7

HP 45

Speed 30 feet, climb 30 feet

Melee Mandibles +11 (reach 10), Damage 1d10+6 piercing plus Whiptail Centipede Venom

Melee Tail +11 (agile, reach 15), Damage 1d6+6 bludgeoning plus Knockdown

Attack of Opportunity (Tail Only)

Tail Only

Trigger A creature within the monster's reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using.

Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and the trigger was a manipulate action, the monster disrupts that action. This Strike doesn't count toward the monster's multiple attack penalty, and its multiple attack penalty doesn't apply to this Strike.

Undulate

The giant whiptail centipede Strides or Steps. During this movement, it can pass through spaces as narrow as 5 feet without Squeezing.

Whiptail Centipede Venom (poison)

Saving Throw DC 19 Fortitude

Maximum Duration 6 rounds

Stage 1 1d10 poison damage and Clumsy 1 (1 round)

Stage 2 2d10 poison damage and Clumsy 1 (1 round)

Stage 3 2d10 poison damage and Clumsy 2 (1 round)

Knockdown

Requirements The monster's last action was a successful Strike that lists Knockdown in its damage entry

Effect The monster attempts to Trip the creature. This attempt neither applies nor counts toward the monster's multiple attack penalty.

Pathfinder Bestiary 2OGL